Beginning Feb. 1, Apple will no longer accept apps or app updates not built with the latest version of Xcode 5. Additionally, after that date, Cupertino will no longer approve apps or app updates not optimized for iOS 7.

Under the headline, “Make Your Apps Work Seamlessly with iOS 7,” Apple makes it clear that the time is now for developers to hop on the iOS 7 express. For assistance, Cupertino points developers to the company’s iOS Human Interface Guidelines.

Apple first announced iOS 7 at the Worldwide Developers Conference in June. Six iOS 7 betas followed. The first public release of iOS 7 was on Sept. 20. Developers are currently testing iOS 7.1 beta 2.

See also: Concept Shows How An iOS 7-Inspired OS X Update Could LookReport Says Siri’s Accuracy Continues To Improve, and Apple Launches iBeacon In Retail Stores, Updates The Apple Store iOS App.